These particles were used in a spectroscopy technique pioneered by Bertram 
These particles were used in a spectroscopy technique pioneered by Bertram Brockhouse, and Bruce Cork discovered their antiparticles while at LBNL. Formed by beta-plus decay or electron capture, these particles contain one up-quark and two down-quarks. Slow-moving ones can strike an atom to initiate a fission reaction. For 10 points, name these particles, first discovered by James Chadwick, that are located in the atomic nucleus and lack charge.
These particles were used in a spectroscopy technique pioneered by Bertram Brockhouse, and Bruce Cork discovered their antiparticles while at LBNL.
{neutrons}